An ammonia reformed zero-carbon combustion system for industry

Abstract

This application discloses an industrial ammonia-modified zero-carbon combustion system, comprising an economizer, a steam drum, a spiral ammonia decomposition reactor, a liquid flow channel, multiple combustion devices, and a shell. The economizer is connected to the steam drum, which includes multiple inlets and multiple outlets. One inlet and one outlet of the steam drum are respectively connected to both ends of the liquid flow channel. The inlets, outlets, and liquid flow channel together form a closed loop. The closed loop formed by the inlets, outlets, and liquid flow channel surrounds the spiral ammonia decomposition reactor and the multiple combustion devices, and gaps exist between the closed loop, the spiral ammonia decomposition reactor, and the multiple combustion devices. The closed loop formed by the inlets, outlets, and the liquid flow channel, the spiral ammonia decomposition reactor, and the multiple combustion devices are all disposed inside the shell. This industrial ammonia-modified zero-carbon combustion system effectively utilizes the heat generated during the combustion process, and the exhaust gas after combustion is zero-carbon, which has significant implications for environmental protection.

Description

Technical Field

[0001] This invention relates to the field of ammonia-hydrogen energy equipment technology, specifically to an industrial ammonia-modified zero-carbon combustion system. Background Technology

[0002] With the increasing severity of global climate change and environmental problems, reducing greenhouse gas emissions and achieving sustainable development has become a global consensus. Particularly in the industrial sector, where high energy consumption and carbon emissions necessitate addressing low-carbon or even zero-carbon production. Among numerous industrial fuels, ammonia (NH3) is considered a potential zero-carbon fuel due to its unique properties. First, ammonia is a carbon-free compound; its combustion products are only water and nitrogen, thus achieving zero carbon emissions. Second, ammonia has a high energy density and a low liquefaction temperature (-33°C), facilitating storage and transportation. Furthermore, ammonia can be produced from clean energy sources (such as wind and solar power), making it renewable and sustainable. However, traditional ammonia combustion systems face several technical challenges, such as slow combustion speed, high ignition energy, and a narrow flammability range, which limit the application of ammonia in the industrial sector.

[0003] Chinese patent CN11541982A discloses a boiler system for ammonia-hydrogen co-combustion, comprising multiple mixers. One mixer inlet is connected to both hydrogen and ammonia. The mixed gas, after being discharged, is heated by a heat exchanger and then enters the boiler burner for combustion. The exhaust gas further heats the ammonia, causing it to decompose and produce hydrogen and nitrogen, which, along with air, enter the boiler for combustion. The ammonia, along with exhaust gas from another heat exchanger, enters another mixer. The mixed gas discharged from this mixer is cooled and then enters a denitrification tower for denitrification. This boiler system utilizes ammonia to produce hydrogen through ammonia cracking, which is then mixed with ammonia for combustion, achieving energy utilization and stable combustion of ammonia while reducing nitrogen oxide emissions. However, the ammonia decomposition efficiency of this boiler system cannot be simultaneously controlled and guaranteed, and the energy of the combustion products is low, resulting in overall low efficiency. Summary of the Invention

[0004] To address the shortcomings of existing boiler combustion systems, such as high carbon emissions during combustion, inability to simultaneously control ammonia decomposition efficiency, and low energy content of boiler combustion products, this paper proposes an energy-saving and environmentally friendly industrial ammonia-modified zero-carbon combustion system that produces carbon-free exhaust gases, efficiently decomposes ammonia, and generates high-energy combustion products.

[0005] The technical solution adopted by this invention to solve its technical problem is: an industrial ammonia-modified zero-carbon combustion system, comprising an economizer, a steam drum, a spiral ammonia decomposition reactor, a liquid flow channel, multiple combustion devices, and a shell. The economizer is connected to the steam drum and is used to introduce liquid water into the steam drum. The steam drum includes multiple inlets and multiple outlets, and one inlet and one outlet of the steam drum are respectively connected to both ends of the liquid flow channel. The inlets, outlets, and liquid flow channel together form a closed loop. Liquid water introduced from the steam drum circulates in the liquid flow channel. The closed loop formed by the inlets, outlets, and liquid flow channel surrounds the spiral ammonia decomposition reactor and multiple combustion devices. There are gaps between the closed loop and the spiral ammonia decomposition reactor, and there are gaps between the closed loop and the multiple combustion devices. The closed loop formed by the inlets, outlets, and liquid flow channel, the spiral ammonia decomposition reactor, and the multiple combustion devices are all located inside the shell.

[0006] Furthermore, the spiral ammonia decomposition reactor includes an ammonia inlet, multiple spiral reaction components, multiple connecting pipes, and a decomposition gas outlet. The multiple spiral reaction components are stacked sequentially, with one end of one spiral reaction component connected to the ammonia inlet and one end of another spiral reaction component connected to the decomposition gas outlet. The multiple spiral reaction components are connected sequentially through connecting pipes, and there are gaps between adjacent spiral reaction components. When ammonia is introduced from the ammonia inlet, it can pass through the multiple spiral reaction components and multiple connecting pipes in sequence, and finally be discharged from the decomposition gas outlet.

[0007] Furthermore, the reaction component includes a first helical conduit and a second helical conduit. One port of the first helical conduit is located away from the internal center of the reaction component, and the first helical conduit extends spirally inward from the port located away from the internal center of the reaction component towards the internal center of the reaction component. One port of the second helical conduit is located close to the internal center of the reaction component, and the second helical conduit extends spirally outward from the port located close to the internal center of the reaction component towards the internal center of the reaction component. The end of the second helical conduit close to the internal center of the reaction component is connected to the first helical conduit through a connecting conduit.

[0008] Furthermore, the first spiral pipe and the second spiral pipe are arranged at intervals from each other, and there is a gap between the first spiral pipe and the adjacent second spiral pipe.

[0009] Furthermore, an auxiliary reactor is provided between the decomposition gas outlet of the spiral ammonia decomposition reactor and the combustion inlet of the combustion device. The auxiliary reactor is filled with a ruthenium-based catalyst with a reaction temperature of less than 500°C and is located outside the shell.

[0010] Furthermore, an electric heating jacket is installed on the outside of the auxiliary reactor.

[0011] Furthermore, the shell includes a guiding section and a reaction section, which are connected and the guiding section is located above the reaction section; a closed loop is formed by the inlet, outlet and liquid flow channel, and a spiral ammonia decomposition reactor and multiple combustion devices are all arranged in the reaction section.

[0012] Furthermore, the guiding part includes a vertically arranged first guiding area and a second guiding area, which are connected to each other. The first guiding area is connected to the top of the reaction part, and the cross-sectional area of ​​the first guiding area and the cross-sectional area of ​​the second guiding area are both smaller than the cross-sectional area of ​​the reaction part.

[0013] Furthermore, a superheater is installed in the first guiding zone, and the superheater is connected to one of the outlets of the steam drum; the economizer is installed in the second guiding zone.

[0014] Furthermore, it also includes an air preheater, which is connected to the combustion inlet of multiple combustion devices located in the reaction section, and the air preheater is located in the second guide zone.

[0015] The present invention discloses an industrial ammonia-modified zero-carbon combustion system. This system employs a reaction component composed of multiple spiral pipes, a spiral ammonia decomposition reactor with multiple reaction components stacked and spaced apart, and a liquid flow channel surrounding the spiral ammonia decomposition reactor and multiple combustion devices. This allows the heat generated by the multiple combustion devices during combustion to fully heat the ammonia flowing in each part of the spiral ammonia decomposition reactor, increasing the heat exchange efficiency of the ammonia during its flow. This enables the ammonia to fully and uniformly decompose into hydrogen and nitrogen without an ammonia decomposition catalyst. Simultaneously, the liquid flow channel surrounding the spiral ammonia decomposition reactor... The liquid water in the liquid flow channels outside the reactor and multiple combustion devices is heated and vaporized, increasing the energy of the liquid water. The heat generated by the combustion of the combustion devices can be concentrated to heat the evaporated water vapor under the joint guidance of two parts with different cross-sectional areas of the shell, increasing the heat of the discharged water vapor and the energy utilization rate of the system, and reducing energy consumption. Moreover, the combustion devices use hydrogen and nitrogen produced by the complete decomposition of ammonia as fuel, and only water is produced in the process of efficient combustion and the generation of high-heat water vapor, achieving zero carbon emissions, reducing the damage of greenhouse gases to the environment, and having significant significance for environmental protection. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an industrial ammonia-modified zero-carbon combustion system according to the present invention;

[0018] Figure 2 This is a schematic diagram of the spiral ammonia decomposition reactor of an industrial ammonia-modified zero-carbon combustion system according to the present invention.

[0019] Figure 3 This is a schematic diagram of the spiral ammonia decomposition reactor of an industrial ammonia-modified zero-carbon combustion system according to the present invention from another angle.

[0020] Figure 4 This is a schematic diagram of the reaction component of a spiral ammonia decomposition reactor in an industrial ammonia-modified zero-carbon combustion system according to the present invention. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1-4 As shown, the industrial ammonia-modified zero-carbon combustion system of the present invention includes an economizer 1, a steam drum 2, a spiral ammonia decomposition reactor 3, a liquid flow channel 4, multiple combustion devices 5, and a shell 6.

[0023] The economizer 1 is connected to the steam drum 2, and the economizer 1 is used to introduce liquid water into the steam drum 2.

[0024] The steam drum 2 includes multiple inlets 21 and multiple outlets 22. One inlet 21 and one outlet 22 of the steam drum 2 are respectively connected to both ends of the liquid flow channel 4. The inlet 21, the outlet 22 and the liquid flow channel 4 together form a closed loop. Liquid water introduced from the steam drum 2 circulates in the liquid flow channel 4.

[0025] A closed loop, consisting of the inlet 21, the outlet 22, and the liquid flow channel 4, surrounds the spiral ammonia decomposition reactor 3 and the plurality of combustion devices 5. There are gaps between the closed loop and the spiral ammonia decomposition reactor 3, and between the closed loop and the plurality of combustion devices 5. The closed loop, consisting of the inlet 21, the outlet 22, and the liquid flow channel 4, the spiral ammonia decomposition reactor 3, and the plurality of combustion devices 5 are all disposed inside the shell 6.

[0026] like Figure 1 As shown, the housing 6 includes a guiding portion 61 and a reaction portion 62, which are connected to each other. The cross-sectional area of ​​the guiding portion 61 is smaller than that of the reaction portion 62, and the guiding portion 61 is located above the reaction portion 62. The economizer 1 is connected to the first inlet 211 of the steam drum 2 via a pipe. The economizer 1 introduces liquid water into the first inlet 211 of the steam drum 2 via the pipe. In the steam drum 2, the first inlet 211 is connected to the first outlet 221, and the second inlet 212 and the second outlet 222 of the steam drum 2 are connected. The system can initially evaporate the liquid water introduced from the economizer 1 to form water vapor. The water vapor formed by the initial evaporation is discharged through the second outlet 222. The first outlet 221 is connected to one end of the liquid flow channel 4, and the second inlet 212 is connected to the other end of the liquid flow channel 4. While the liquid water introduced from the economizer 1 is evaporating in the steam drum 2, some of the liquid water can be discharged from the steam drum 2 through the first outlet 221 and enter the liquid flow channel 4 connected to it. After passing through the liquid flow channel 4, it is discharged into the steam drum 2 through the second inlet 212 for further vaporization to form water vapor.

[0027] The liquid flow channel 4 extends towards the bottom of the reaction section 62, then turns back towards the second inlet 212 of the steam drum. The liquid flow channel 4 is a curved structure, allowing the liquid water discharged from the steam drum 2 to flow in a curved manner within it. Simultaneously, the curved liquid flow channel 4 surrounds the spiral ammonia decomposition reactor 3 and the multiple combustion devices 5. Gaps exist between the liquid flow channel 4, the spiral ammonia decomposition reactor 3, and the multiple combustion devices 5, and the multiple combustion devices 5 are spaced apart from the spiral ammonia decomposition reactor 3. To improve the heating effect of the spiral ammonia decomposition reactor 3 and promote the effective distribution of heat in the combustion system to fully enhance the ammonia decomposition effect, preferably, multiple combustion devices 5 are vertically arranged below the spiral ammonia decomposition reactor 3, with the multiple combustion devices 5 evenly arranged and spaced apart from each other; the multiple combustion devices 5 and the spiral ammonia decomposition reactor 3 are spaced apart, and the heat generated by the multiple combustion devices 5 during combustion can flow upward, thereby directly heating the spiral ammonia decomposition reactor 3, improving the effective utilization of the heat generated by combustion, promoting the heating of ammonia in the spiral ammonia decomposition reactor 3, and causing the ammonia to decompose into hydrogen and nitrogen.

[0028] like Figures 2-4 As shown, the spiral ammonia decomposition reactor 3 includes an ammonia inlet 301, multiple spiral reaction components 31, multiple connecting pipes 32, and a decomposition gas outlet 302. The multiple spiral reaction components 31 are arranged in a stacked manner. One end of one spiral-shaped reaction component 31 is connected to the ammonia inlet 301, and one end of another spiral-shaped reaction component 31 is connected to the decomposition gas outlet 302. Multiple spiral-shaped reaction components 31 are sequentially connected by multiple connecting pipes 32, with each connecting pipe 32 corresponding to the end of an adjacent spiral-shaped reaction component 31. This allows ammonia to flow sequentially through multiple spiral-shaped reaction components 31 stacked in the height direction, thereby increasing the heat exchange time and flow distance of the ammonia and promoting its effective thermal decomposition. Preferably, gaps exist between adjacent spiral-shaped reaction components 31, allowing the heat generated by the combustion device 5 to pass evenly and sequentially through the multiple spiral-shaped reaction components 31. This increases the heat exchange area between the combusted gas and the ammonia inside the reaction component 31, thereby heating each part of the multiple spiral-shaped reaction components 31 and improving their heating efficiency and heat transfer coefficient for ammonia.

[0029] To further improve the heat exchange effect during gas flow and maximize the flow time and distance of ammonia, allowing for more complete thermal decomposition of ammonia and reducing the use of catalysts, thereby lowering the operating cost and energy consumption of ammonia decomposition, preferably, the reaction component 31 includes a first spiral pipe 311 and a second spiral pipe 312 arranged close to each other. One port of the first spiral pipe 311 is located away from the internal center of the reaction component 31, and the first spiral pipe 311 extends spirally inward from the port located away from the internal center of the reaction component 31 towards the internal center of the reaction component 31. One port of the second spiral pipe 312 is located close to the internal center of the reaction component 31, and the second spiral pipe 312 extends spirally inward from the port located close to the internal center of the reaction component 31 towards the internal center of the reaction component 31. The first spiral pipe 311 is spirally extended outward from the starting point, away from the center of the reaction component. The end of the second spiral pipe 312 closest to the center of the reaction component 31 is connected to the first spiral pipe 311 via a second connecting pipe 313. To effectively utilize the heat of the gas during flow and promote heat transfer during gas flow, thereby improving heat utilization efficiency, preferably, the first spiral pipe 311 and the second spiral pipe 312 are spaced apart from each other. A gap exists between the first spiral pipe 311 and the adjacent second spiral pipe 312, allowing the heat generated after combustion to simultaneously exchange heat with the ammonia in both the first spiral pipe 311 and the second spiral pipe 312 through the gap between them, thus improving heating efficiency.

[0030] Ammonia gas enters the first spiral pipe 311 through the port away from the internal center of the reaction component 31. It flows along the curved first spiral pipe 311 towards the internal center of the reaction component 31, then enters the second spiral pipe 312 near the internal center of the reaction component 31 through the connected second connecting pipe 313, and flows along the extension direction of the second spiral pipe 312 towards the end away from the internal center of the reaction component 31. Finally, it exits the second spiral pipe 312 and enters the first spiral pipe 311 of the next spiral-shaped reaction component 31 through the corresponding connecting pipe 32. Spiral flow; during gas flow, the heat of the gas located between the first spiral pipe 311 and the second spiral pipe 312 can be transferred to each other. Since the gas flows in opposite directions between the first spiral pipe 311 and the second spiral pipe 312, a staggered flow is formed. Therefore, the heat of the gas itself can be transferred more effectively and evenly between the gases, improving the uniform distribution of heat and the effective heating of ammonia, so that ammonia can be fully decomposed by heat. At the same time, connecting the first spiral pipe 311 and the second spiral pipe 312 with opposite extension directions maximizes the flow distance and heating time of ammonia, so that ammonia can be fully decomposed and the hydrogen content in the decomposed gas is increased.

[0031] The decomposition gas outlet 302 of the spiral ammonia decomposition reactor 3 is connected to the combustion inlet of the combustion device 5. The hydrogen-containing mixed gas after decomposition by the spiral ammonia decomposition reactor 3 enters the combustion inlet of the combustion device 5 through a pipe for combustion, providing fuel for the combustion device 5. Preferably, to more fully utilize the heat of the decomposition gas itself to ensure further decomposition of residual ammonia in the decomposition gas, an auxiliary reactor 9 is preferably provided between the decomposition gas outlet 302 and the combustion inlet of the combustion device 5. The auxiliary reactor 9 is filled with a ruthenium-based catalyst with a reaction temperature below 500°C. The decomposition gas after reaction by the spiral ammonia decomposition reactor 3 exits from the decomposition gas outlet 32 ​​and enters the auxiliary reactor 9. Because the auxiliary reactor 9 is filled with a ruthenium-based catalyst with a reaction temperature below 500°C, the ammonia in the decomposition gas can combine with the ruthenium-based catalyst at a relatively low temperature to react. The biodecomposition reaction generates hydrogen and nitrogen, increasing the purity of hydrogen in the decomposed gas and thus effectively improving the combustion effect of the subsequent combustion process. The decomposed gas, after further decomposition by the auxiliary reactor 9, is fed into the combustion device 5 located inside the shell 6 for combustion. Since the ammonia has undergone sufficient heating and decomposition, the hydrogen content in the decomposed gas is high, which is beneficial to improving the combustion efficiency of the combustion device 5 and feeding back to the heating of ammonia in the spiral ammonia decomposition reactor 3, thereby improving the heating efficiency of ammonia and promoting its decomposition. Preferably, the auxiliary reactor 9 is equipped with an electric heating jacket 91, which provides heat to the auxiliary reactor 9 to ensure that the ammonia in the decomposed gas can react fully. Specifically, the auxiliary reactor 9 is located outside the shell 6, which can reduce the impact of high temperature on catalyst activity during the combustion process of the combustion device 5 and ensure that the ammonia can effectively undergo a decomposition reaction after entering the auxiliary reactor 9.

[0032] Since the spiral ammonia decomposition reactor 3, the curved liquid flow channel 4, and the multiple combustion devices 5 are all located inside the reaction section 62 of the shell 6, and the curved liquid flow channel 4 surrounds the spiral ammonia decomposition reactor 3 and the multiple combustion devices 5, when the multiple combustion devices 5 start to burn and generate heat, the liquid water in the curved liquid flow channel 4 can isolate the heat generated by the combustion of the combustion devices 5 during its flow, so that the heat can be kept in the closed loop formed by the liquid flow channel 4, thereby fully transferring it to the ammonia flowing in the spiral ammonia decomposition reactor 3, reducing heat loss during operation, promoting the effective decomposition of ammonia, and similarly increasing the hydrogen content in the fuel of the combustion devices 5, so that the multiple combustion devices 5 can burn completely and generate sufficient heat; and the heat generated by the multiple combustion devices 5 during combustion can also simultaneously heat the liquid water flowing in the liquid flow channel 4. This promotes the vaporization of liquid water and increases its temperature. The vaporized liquid water then re-enters the steam drum 2 through the liquid flow channel 4 to evaporate and generate steam, thereby improving the steam output and operating efficiency of the industrial ammonia-modified zero-carbon combustion system and achieving effective utilization of the heat generated during combustion. Similarly, due to the distance between the spiral ammonia decomposition reactor 3, the multiple combustion devices 5, and the liquid flow channel 4, the spacing between the multiple reaction components 31 of the spiral ammonia decomposition reactor 3, and the gap between the first spiral pipe 311 and the second spiral pipe 312, the heat generated during combustion can fully and uniformly heat each part of the spiral ammonia decomposition reactor 3 during the flow process. This increases the heat exchange area and improves the heating efficiency, allowing ammonia to be fully decomposed into hydrogen and nitrogen in the spiral ammonia decomposition reactor 3, reducing the use of ammonia decomposition catalyst and lowering operating costs.

[0033] To more effectively utilize the heat generated during combustion, promote steam production in the system, and reduce heat loss during combustion, the guiding section 61 preferably includes a vertically arranged first guiding area 611 and a second guiding area 612. The first guiding area 611 and the second guiding area 612 are connected. The first guiding area 611 is connected to the top of the reaction section 62. The cross-sectional areas of both the first guiding area 611 and the second guiding area 612 are smaller than the cross-sectional area of ​​the reaction section 62. A superheater 7 is provided in the first guiding area 611. The superheater 7 is connected to the second outlet 222 of the steam drum 2. The superheater 7 is used to further heat the steam discharged from the second outlet 222 of the steam drum 2 to increase the temperature of the discharged steam and further heat and vaporize the liquid water mixed in the steam, thereby improving the evaporation effect of the liquid water. Since the first guiding area 611 is located above the reaction section 62, when the multiple combustion devices 5 in the reaction section 62 generate heat through combustion... The generated heat can flow upward toward the reaction component 62 and pass through the first guide zone 611, which is connected to the top of the reaction component 62. Since the cross-sectional area of ​​the first guide zone 611 is smaller than that of the reaction component 62, the heat can be collected when it flows through the first guide zone 611, thereby heating the superheater 7 and the water vapor therein. This achieves effective utilization of the heat generated by the combustion of multiple combustion devices 5, increases the heat of the steam generated by the combustion system, reduces the energy required for additional electric heating evaporation, improves the overall energy utilization rate and operating efficiency of the system, and generates water vapor with higher heat.

[0034] Furthermore, the second guide zone 612, which is connected to the first guide zone 611, is arranged perpendicularly to the first guide zone 611. This can further increase the residence time and dispersion of the discharged heat in the guide section 61, so that the heat generated by the combustion of the multiple combustion devices 5 can be more fully transferred to the steam. Preferably, the economizer 1 is arranged in the second guide zone 612, thereby heating the liquid water flowing through the economizer 1 with the heat generated by the combustion of the multiple combustion devices 5, reducing the heat required for subsequent steam drum evaporation and vaporization, and reducing the energy consumption of the system.

[0035] To improve the combustion effect of the multiple combustion devices 5 and provide heat for ammonia decomposition and liquid water evaporation, thereby improving the efficiency of ammonia decomposition and liquid water evaporation, preferably, an air preheater 8 is provided in the second guide zone 612. The air preheater 8 is connected to the combustion inlet of the multiple combustion devices 5 located in the reaction section 62 via a pipe. The air preheater 8 is used to introduce oxygen into the multiple combustion devices 5 and heat the introduced oxygen to promote the combustion of the multiple combustion devices 5, thereby generating more heat and improving the efficiency of ammonia decomposition and liquid water evaporation.

[0036] The industrial ammonia-modified zero-carbon combustion system described in this application employs a reaction component composed of multiple spiral pipes, a spiral ammonia decomposition reactor with multiple reaction components stacked and spaced apart, and a liquid flow channel 4 surrounding the spiral ammonia decomposition reactor and multiple combustion devices 5. This allows the heat generated by the multiple combustion devices 5 during combustion to sufficiently heat the ammonia gas flowing in each part of the spiral ammonia decomposition reactor, increasing the heat exchange efficiency of the ammonia gas during its flow. This enables the ammonia gas to fully and uniformly decompose into hydrogen and nitrogen gas without an ammonia decomposition catalyst. Simultaneously, the liquid flow channel 4 surrounding the spiral ammonia decomposition reactor... The liquid water in the liquid flow channel 4 outside the device and multiple combustion devices 5 is heated and vaporized, which increases the energy of the liquid water. At the same time, the heat generated by the combustion of the combustion device 5 can be concentrated to heat the evaporated water vapor under the joint guidance of the two parts of the shell 6 with different cross-sectional areas, which increases the heat of the discharged water vapor and the energy utilization rate of the system, and reduces energy consumption. Moreover, the combustion device 5 uses hydrogen and nitrogen produced by the full decomposition of ammonia as fuel. In the process of efficient combustion and the generation of high-heat water vapor, only water is produced, which realizes zero carbon emissions, reduces the damage of greenhouse gases to the environment, and has significant significance for environmental protection.

[0037] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An industrial ammonia-modified zero-carbon combustion system, comprising an economizer, a steam drum, a spiral ammonia decomposition reactor, a liquid flow channel, multiple combustion devices, and a shell, characterized in that: The economizer is connected to the steam drum, and the economizer is used to introduce liquid water into the steam drum. The steam drum includes multiple inlets and multiple outlets, and one inlet and one outlet of the steam drum are respectively connected to both ends of the liquid flow channel; the inlet and outlet connected to both ends of the liquid flow channel and the liquid flow channel together form a closed loop; liquid water introduced from the steam drum circulates in the liquid flow channel; The spiral ammonia decomposition reactor includes an ammonia inlet, multiple spiral reaction components, multiple connecting pipes, and a decomposition gas outlet. The multiple spiral reaction components are stacked sequentially. One end of one spiral reaction component is connected to the ammonia inlet, and one end of another spiral reaction component is connected to the decomposition gas outlet. The multiple spiral reaction components are connected sequentially through the connecting pipes. There are gaps between adjacent spiral reaction components. When ammonia gas is introduced from the ammonia inlet, the ammonia gas can pass through the multiple spiral reaction components and the multiple connecting pipes sequentially, and finally be discharged from the decomposition gas outlet. A closed loop surrounds the spiral ammonia decomposition reactor and the plurality of combustion devices. There is a gap between the closed loop and the spiral ammonia decomposition reactor, and there is a gap between the closed loop and the plurality of combustion devices. The closed loop, the spiral ammonia decomposition reactor, and the plurality of combustion devices are all disposed inside the shell.

2. The industrial ammonia-modified zero-carbon combustion system according to claim 1, characterized in that: The reaction component includes a first spiral conduit and a second spiral conduit. One port of the first spiral conduit is located away from the internal center of the reaction component, and the first spiral conduit extends spirally inward from the port located away from the internal center of the reaction component towards the internal center of the reaction component. One port of the second spiral conduit is located near the internal center of the reaction component, and the second spiral conduit extends spirally outward from the port located near the internal center of the reaction component towards the internal center of the reaction component. The end of the second spiral conduit near the internal center of the reaction component is connected to the first spiral conduit through a second connecting conduit.

3. The industrial ammonia-modified zero-carbon combustion system according to claim 2, characterized in that: The first spiral pipe and the second spiral pipe are spaced apart from each other, and there is a gap between the first spiral pipe and the adjacent second spiral pipe.

4. The industrial ammonia-modified zero-carbon combustion system according to claim 1, characterized in that: An auxiliary reactor is provided between the decomposition gas outlet of the spiral ammonia decomposition reactor and the combustion inlet of the combustion device. The auxiliary reactor is filled with a ruthenium-based catalyst with a reaction temperature of less than 500°C and is located outside the shell.

5. The industrial ammonia-modified zero-carbon combustion system according to claim 4, characterized in that: The auxiliary reactor is fitted with an electric heating jacket.

6. The industrial ammonia-modified zero-carbon combustion system according to claim 1, characterized in that: The housing includes a guiding section and a reaction section, which are connected and the guiding section is located above the reaction section; the closed loop, the spiral ammonia decomposition reactor, and the plurality of combustion devices are all disposed in the reaction section.

7. The industrial ammonia-modified zero-carbon combustion system according to claim 6, characterized in that: The guiding portion includes a vertically arranged first guiding area and a second guiding area, which are connected to each other. The first guiding area is connected to the top of the reaction portion, and the cross-sectional areas of the first guiding area and the second guiding area are both smaller than the cross-sectional area of ​​the reaction portion.

8. The industrial ammonia-modified zero-carbon combustion system according to claim 7, characterized in that: A superheater is provided in the first guide zone, and the superheater is connected to one of the outlets of the steam drum; the economizer is provided in the second guide zone.

9. The industrial ammonia-modified zero-carbon combustion system according to claim 7, characterized in that: It also includes an air preheater, which is connected to the combustion inlet of a plurality of combustion devices located in the reaction section, and the air preheater is disposed in the second guide zone.

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